React-native-ble-plx: How to write to an unknown service?

[lenninlc]

So far I've been able to write and read using the UART service (TX, RX)

Script:

var base64 = require("base-64");

var device;
var manager;

var serviceUUID = "6e400001-b5a3-f393-e0a9-e50e24dcca9e";
var writeUUID = "6e400002-b5a3-f393-e0a9-e50e24dcca9e";
var notifyUUID = "6e400003-b5a3-f393-e0a9-e50e24dcca9e";

export default {
sendMessage(message) {
this.device
.writeCharacteristicWithResponseForService(
serviceUUID,
writeUUID,
base64.encode(message)
)
.catch(error => {
Alert.alert(
"Device Lost Connection",
"You lost connection probably. Please bind from main menu to continue."
);
});
},

listenForMessage(response) {
this.device.monitorCharacteristicForService(
serviceUUID,
notifyUUID,
(error, res) => {
if (res != null) response(base64.decode(res.value.toString()));
else console.log("Disconnected! Please stop!");
}
);
},

disconnect() {
if (this.device != null) {
if (this.device.isConnected()) {
this.device.cancelConnection();
}
}
},
However, when I tried to do the same with and unknown service It does not work. Do I have to add something on my script for an unknown service? thanks!

[Cierpliwy]

Did you call discoverAllServicesAndCharacteristicsForDevice? After that you can check which services/characteristics are available by calling servicesForDevice/characteristicsForDevice. Make sure that your unknown service is present there.

[lenninlc]

Thank you

[LingboTang]

@lenninlc listenForMessage(response) , response is a callback to manipulate the res right?
@Cierpliwy Is monitor a global subscription once turned on?